Author(s)

Ryosuke Kohno^1*, Hidenori Yamaguchi², Kana Motegi¹, Fumiya Tanaka¹, Tsunemichi Akita¹, Yuki Nagata², Kenji Hotta¹, Tomoko Miyagishi¹, Shie Nishioka¹, Takeshi Dohmae¹, Tetsuo Akimoto¹

¹Particle Therapy Division, National Cancer Center Hospital East, Kashiwa, Japan.
²Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan.

The accuracy of the position measurements obtained by the radiation positioning system (RADPOS) was evaluated under static and dynamic conditions. In the static verifications, the RADPOS was fixed to the treatment couch in a photon treatment room and a proton treatment room, and was translocated with the treatment couch in x, y and z directions. Because the presence of magnetic and/or electrically conductive materials can cause a systematic shift in the measured position by distorting the RADPOS transmitted field, the effect of metals on the performance of the positioning system was also investigated. Dynamic verification was performed using the couch drive and a dynamic anthropomorphic thorax phantom. We thus confirmed the utility of RADPOS as a position sensor to perform in vivo dosimetry.

RADPOS, MOSFET, In-Vivo Dosimetry, Position Sensor, Photon Therapy, Proton Beam Therapy

Kohno, R. , Yamaguchi, H. , Motegi, K. , Tanaka, F. , Akita, T. , Nagata, Y. , Hotta, K. , Miyagishi, T. , Nishioka, S. , Dohmae, T. and Akimoto, T. (2015) Position Verification of the RADPOS 4-D In-Vivo Dosimetry System. International Journal of Medical Physics, Clinical Engineering and Radiation Oncology, 4, 318-325. doi: 10.4236/ijmpcero.2015.44038.